Chuck.



P.'L. SESSIONS.

' CHUCK. APPLICATION IILED AUG. 5 191a.

Patented Feb. 17, 1914.

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FRANK L. SESSIONS, OF LAKEWOOD, OHIO, ASSIGNOR T0 THESTANDARD WELDINGCOMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

CHUCK.

To all whom it may concern:

Be it lmown that I, FRANK L. Sessions, a citizen of the United States,and a resident of Lakewood, county of Cuyahoga, and State of Ohio, haveinvented a new and useful Improvement in Chucks, of which the followingis a specification, the principle of the invention being hereinexplained and the best mode in which I have contemplated applying thatprinciple, so as to distinguish it from other inventions.

The subject of the present invention 1s a chuck which is adapted toreceive large members for working, the chuck being here illustrated inconnection with a rim such as is used for automobile tires, although itwill be understood that the chuck is not limited to this use. In myimproved chuck a plurality of segmental blocks are used, each of whichis held in position upon a suitable face plate, all of the blocks beingmoved transversely of the inner face of the face plate andsimultaneously radially inward upon the operation of a single memberwhich engages all of the blocks.

To the accomplishment of these and related ends, said invention, then,consists of the means hereinafter fully described and particularlypointed out in the claims.

The annexed drawing and the following description set forth in detailcertain mechanism embodying the invention, such disclosed meansconstituting, however, but one of various mechanical forms in which'theprinciple of the invention may be used.

In said annexed clrawing:Figure1 is a plan View of half of my improvedchuck; Fig. 2 is a section on the line 22 in Fig. l; and Fig. 3 is asection on the line 33 in Fig. 2.

The chuck here illustrated is adapted to be connected to a boring mill,a suitable face plate 1 being provided, such face plate having aplurality of lugs 52 for attachment to Specification of Letters Patent.

Application filed August 5, 1913.

Patented Feb.17, 1914.

Serial No. 783,029.

blocks there is mounted one or more guide members 8 adapted to snuglybut slidably engage in the T-shaped grooves in the face plate.

An annular member 9 is attached exter nally of the segmental blocks 6,and is threaded internally at 10 adapting it to adjustably engage overthe threading 3 on the exterior of the face plate. The annular member isprovided with two spaced flanges l1 and 12 which contact on either sideof the flange 7 on the segmental blocks. Socket members 13 are formed onthe upper side of the annular member for the purpose of receiving barsfor convenient rotation and adjustment of this member.

In operation the annular member is moved downwardly toward the faceplate thus drawing the segmental blocks radially inward and downwardinto the face plate until they securely grip the rim 14. The rim canthen be faced on its outer edge, or threaded internally, which are thetwo operations that are commonly performed upon such an article. Forconvenience I employ 2|: STATES PATENT orrio. I

supports 20, generally wooden blocks, to 7 limit the position of the mm,the supports being placed on the face of the boring mill;

The advantages of the present chuck are its simplicity, there being buttwo main members and a plurality of segments, together with the ease ofadjustment. As to adjustment, it is only necessary to rotate the annularmember in the proper direction. It will also be noted that the segmentalblocks are moved across the face plate and radially inwardsimultaneously and evenly, thus securing a proper clamping on thearticle which is to be operated upon.

Other modes of applying the principle of my invention may be employedinstead of the one explained, change being made as regards the mechanismherein disclosed, provided the means stated by any of the followingclaims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as myinvention 1. In a chuck, the combination of an open annular internallybeveled face plate having transversely extending grooves in the beveledsurface; a plurality of segmental blocks slidably contacting the beveledsurface of said plate; members attached to said blocks and snugly butslidably engaging in such grooves in the surface of said plate; andmeans adapted to simultaneously move said blocks across the beveledsurface of said plate.

2. In a chuck, the combination of an open annular internally beveledface plate having transversely extending undercut grooves in the beveledsurface; a plurality of segmental blocks slidably contacting; thebeveled surface of said plate, each of said blocks having a laterallyprojecting lip; members attached to said blocks and slidably engaging insuch undercut grooves in said plate; and an annular member having aflange adapted to contact such lip on said blocks, said memberadjustably engaging externally on said plate, whereby adjustment of saidannular member moves said blocks simultaneously across the beveledsurface of said plate.

Signed by me this 2nd day of August,

FRANK L. SESSIONS. Attested by" H. B. FAY, A. L. GILL.

flcpiezr of this patent may be obtained for five cents each, byaddressing the Commissioner of Eatenta, Washington, 13. 0.

